For one of your table options grouping floating candle vases together is a pretty option for a non-floral centerpieces. To add the "wow", tint the water in some of the vases a dark purple and some a light purple and float gold candles.
Alternating votive and taper candles is both beautiful and practical, allowing guests to interact across this simply chic reception table. The cylindrical vases will protect the candles from accidentally falling.
Bring color in with the centerpieces. A little bit of food color & water with some floating candles. Cylinders from dollar store. I like that we can bring in the "tiffany blue" color with the orange flowers and white candles